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I have a simple suggest.Each level,when you reach on the necessary xp,you automatic gain another level.My suggestion is for change it:for gain another level you could to need to click over a level up button.After click,that will charge another page "are you sure",you can click yes or no.Why I make this suggestion?Many people like to hold rank,right?Some like to hold level too,for tactical or anything.

No, people can already rank hold. Level-holding is not a good idea, cause many people wouldn't use it, what with the extra pools given for each new level. Also, at level 74 where the lower-levels/ranks special boost ends, people would level hold, making it further unfair to the higher rank and levels who got there before the boost was implemented. Also, beyond that, level holding has no point.